Cool thanks for the results
The problem with calling for me is just preflop, UTG 4betting ranges are too tight and you also 3bet huge. It's true BXB on 4 flush is overbluffed but it's pretty nuanced in that it's much less bluffed on monotone flops as opposed to 2tone etc. And much less bluffed on turn 4 to flush as opposed to river 4 flush. All this stuff matters when deciding when to call.
I have some MDA I can share in BXB UTG-HJvsIP. Samples aren't great but it's better than nothing.